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Assertion(A):: The electrical conductivity of a semiconductor increases on doping.
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Sep 18, 2022
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Physics
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Haren
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class-12
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Assertion(A) : The photoelectrons produced by a monochromatic light beam incident on a metal surface have a spread in their kinetic energies.
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Haren
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Assertion(A): In an interference pattern observed in Young's double slit experiment, if the separation (d) between coherent sources as well as the distance
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If the reading of the voltmeter V1 is 40 V, then the reading of voltmeter V2 is
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Which of the following statements about nuclear forces is not true? (i) The nuclear force between two nucleons falls rapidly to zero as their distance is more than a few femtometres.
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Sep 18, 2022
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The radius of the innermost electron orbit of a hydrogen atom is 5.3×10-11 m. The radius of the n =3 orbit is
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The work function for a metal surface is 4.14 eV. The threshold wavelength for this metal surface is
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In a Young’s double slit experiment, the path difference at a certain point on the screen between two interfering waves is 1/8 th of the wavelength.
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Sep 18, 2022
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A rectangular, a square, a circular and an elliptical loop, all in the (x-y) plane, are moving out of a uniform magnetic field with a constant velocity v = v̂i
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Sep 18, 2022
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Physics
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Haren
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Which of the following statement is NOT true about the properties of electromagnetic waves?
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Sep 18, 2022
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Physics
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An iron cored coil is connected in series with an electric bulb with an AC source as shown in figure. When iron piece is taken out of the coil, the brightness of the bulb will
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Sep 18, 2022
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If the magnetizing field on a ferromagnetic material is increased, its permeability
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A long straight wire of circular cross section of radius a carries a steady current I. The current is uniformly distributed across its cross section
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Two concentric and coplanar circular loops P and Q have their radii in the ratio 2:3. Loop Q carries a current 9 A in the anticlockwise direction.
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The temperature (T) dependence of resistivity of materials A and material B is represented by fig (i) and fig (ii) respectively. Identify material A and material B.
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Sep 18, 2022
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The electric potential on the axis of an electric dipole at a distance ‘r from it’s centre is V. Then the potential at a point at the same distance on its equatorial line will be
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According to Coulomb's law, which is the correct relation for the following figure? (i) q1 q2> 0 (ii) q1 q2<0
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Sep 18, 2022
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Electromagnetic waves with wavelength (i) λ1 is suitable for radar systems used in aircraft navigation. (ii) λ2 is used to kill germs in water purifiers.
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Sep 18, 2022
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Kamal
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A uniform magnetic field gets modified as shown in figure when two specimens A and B are placed in it. (i) Identify the specimen A and B.
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Sep 18, 2022
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Kamal
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What is the nuclear radius of 125Fe ,if that of 27 Al is 3.6 fermi?.
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Sep 18, 2022
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Kamal
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